I have created a few tables in Power Apps and published them. In Copilot Studio, I connected those tables in the knowledge section. However, the problem is that the table is still in "in progress" status. I've been waiting for more than 10 hours, but it's not working.
This was solved by MS, it seems. No longer happening, we opened a ticket and they told us it was a preview feature that was being fixed without a deadline and now it's fixed.
I can confirm that we have the same issue trying to load 3 dataverse tables (each with an average of 1000 rows and 100 columns, so not huge tables) as a knowledge source in Copilot a weeks or so ago in UK South. We left this running for days and still has not completed
We tried smaller single tables (100 rows 60 columns) and these still take a very long time to load.
This is a major issue for us and these feature is currently "unusable" but aware the Dataverse in Copilot is "preview" (for us at least).
Will MS look at this issue since it seems to be a problem for several users